Double-layer capillary barrier drainage anti-seepage structure of embankment

Abstract

The invention discloses an embankment double-layer capillary barrier drainage anti-seepage technology which is simple, effective, easy to operate and low in cost. A double-layer capillary barrier drainage anti-seepage structure comprises a fine aggregate layer and a coarse aggregate layer from top to bottom. Particle size grading data of coarse aggregate and fine aggregate are obtained through an indoor test, an optimal particle size grading curve is obtained by applying a statistical method, and the coarse aggregate and the fine aggregate are layered and have the same particle size grading. The drainage anti-seepage structure takes waste construction waste as a raw material, turns waste into wealth, and is beneficial to efficient utilization of resources and sustainable development of the environment. The principle of the invention is based on the difference of soil-water characteristics between coarse and fine aggregate layers, and the drainage and seepage-proofing effects of the capillary barrier structure layer in the embankment can be fully exerted. The drainage and seepage-proofing functions of the capillary barrier structure layer enable the soil layer under the capillary barrier structure layer to be in an unsaturated state for a long time, the initial design strength and bearing capacity of the roadbed are kept, related road diseases caused by rainfall infiltration are prevented, and then the long-term durability and stability of the roadbed are maintained.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to an embankment drainage anti-seepage technology based on the capillary barrier principle. Background technique [0002] In most cases, the near-surface soil above the groundwater table is unsaturated. The soil in the unsaturated state has negative pore water pressure, and its strength and bearing capacity are higher than in the saturated state, and its stability is also better. However, under the action of rainfall, the infiltration of rainwater leads to changes in the original unsaturated state of the soil. As the water content and saturation of the soil increase, the negative pore water pressure increases, and the strength and bearing capacity of the soil decrease. lead to the occurrence of instability disasters. [0003] In road engineering, the strength, bearing capacity and stability of the embankment soil above the groundwater level mainly come from the negative por...

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Problems solved by technology

However, the traditional drainage method has many disadvantages, such as complex process, easy failure, difficult maintenance and high cost, etc.

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